Criddleite Mineral Data

Criddleite Mineral Data

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General Criddleite Information

Chemical Formula:

TlAg2Au3Sb10S10

Composition:

Molecular Weight = 2,549.18 gm

Thallium 8.02 % Tl

Silver 8.46 % Ag

Antimony 47.76 % Sb

Gold 23.18 % Au

Sulfur 12.58 % S

______

100.00 %

Empirical Formula:

TlAg₂Au₃Sb₁₀S₁₀

Environment:

Primary hydrothermal mineral in a complex gold deposit.

IMA Status:

Approved IMA 1988

Locality:

Hemlo gold deposit, near Marathon, Ontario, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for Alan J. Criddle (1944-2002), English mineralogist.

Synonym:

IMA1987-037

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Criddleite Crystallography

Axial Ratios:

a:b:c =2.4773:1:0.9692

Cell Dimensions:

a = 19.96, b = 8.057, c = 7.809, Z = 2; beta = 92.08° V = 1,255.00 Den(Calc)= 6.75

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: A2/m ?

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.813(1), 5.63(0.9), 2.86(0.7),

Physical Properties of Criddleite

Color:

Black.

Diaphaniety:

Opaque

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

3-3.5 - Calcite-Copper Penny

Luster:

Metallic

Streak:

black

Optical Properties of Criddleite

Optical Data:

NCalc= 1.42 - from Gladstone-Dale relationship (KC = 0.0615) where Ncalc=Dcalc*KC+1

RL Anisotrophism:

Distinct to moderate, from buff to slate gray.

RL Color:

Gray-blue.

RL Pleochroism:

Weak, from gray-blue to slightly greenish gray-blue.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Criddleite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	40.60	41.80
420 nm	40.10	41.00
440 nm	39.40	40.10
460 nm	38.60	39.40
480 nm	38.10	39.20
500 nm	37.60	39.10
520 nm	37.30	38.90
540 nm	36.70	38.40
560 nm	36.10	38.00
580 nm	35.60	37.60
600 nm	35.00	37.20
620 nm	34.40	36.60
640 nm	33.70	36.00
660 nm	33.10	35.30
680 nm	32.60	34.60
700 nm	32.50	34.10

**Calculated Relative Intensity Colors of Criddleite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	260%
R₁
R₂

Calculated Properties of Criddleite

Electron Density:

r_electron=5.73 gm/cc
note: r_Criddleite=6.75 gm/cc.

Fermion Index

Fermion Index = 0.00094
Boson Index = 0.99906

Photoelectric:

PE_Criddleite= 699.30 barns/electron
U=PE_Criddleite x r_electron=4,007.03 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Criddleite is Not Radioactive

Criddleite Classification

Dana Class:

3.9.1.1 (3)Sulfides - Sulfosalts

(3.9)where z/y = 1 - (A+)i (A++)j [By Cz], A=metals, B=semi-metals, C=non-metals

(3.9.1)Dana Group

3.9.1.1 Criddleite TlAg2Au3Sb10S10 A2/m ? 2/m

Strunz Class:

II/B.07-30 II - Sulfides and sulphosalts

II/B - Sulfides with metal: sulfur, selenium and tellurium > 1:1, Sulfides, Selenides and Tellurides with predominant Copper and Silver/Gold

II/B.07 - Petrovskaite - Muthmannite series

II/B.07-10 Petrovskaite AuAg(S,Se) P 2/m,P 2,Pm Mono

II/B.07-20 Uytenbogaardtite Ag3AuS2 P 4₁22 4 2 2

II/B.07-30 Criddleite TlAg2Au3Sb10S10 A2/m ? 2/m

II/B.07-40 Penzhinite (Ag,Cu)4Au(S,Se)4 P 6₃22 6 2 2

II/B.07-50 Fischesserite Ag3AuSe2 I 4₁32 4 3 2

II/B.07-60 Petzite Ag3AuTe2 I 4₁32 4 3 2

II/B.07-70 Muthmannite AgAuTe2 P 2/m Ortho

Other Criddleite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.75,p706-713,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Criddleite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Criddleite

TlAg2Au3Sb10S10
Dana No: 3.9.1.1 Strunz No: II/B.07-30
Locality:

Notes: